Resurrecting this old thread one more time. Came across it while doing some water pump research. The question was asked in post #43 what the impeller cast numbers were for the 8-bolt pump and the 11 bolt pump. The 11 bolt pump question was answered for both the 9796351 short pump and the 488296 long pump. I will supply some information for the 8 bolt pump. It appears that there are at least two cast impellers used on the 8 bolt pump. I have a 9772716 pump which I believe is the 64-65 unit and it has a 9773426 or 428 impeller (not sure on the last digit). This pump has M4 cast into it, if that is a date code would be Dec 1964? I have a 9782482 pump which I believe is the 66-68 unit and it has an impeller that looks just like the one on the 9772716 pump. The only number on it is 1352 which could be the last 4 digits of the P/N? This pump only has the P/N and GM3 cast into it no date code. This pump came from a 1967 Firebird 400 engine that I obtained in Feb of 1975, so could be original or possibly a rebuild. The other pump I have is a 9782482 with a date code of B098, so a 1968 pump. This pump has an impeller with P/N 9793124 cast into it. I have another 8 bolt pump that is not a Pontiac casting. It has a diamond cast into it which I think is the Dana logo. This pump has the 9793124 impeller in it. If Dana was building pumps did they purchase impellers from Pontiac? Hope this is helpful to someone.
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